Portable sport timer



FIG. 1 is a front elevational view of a portable sport timer showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 3 is a top plan view thereof, the bottom being plain and unornamented; and,

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a portable sport timer, as shown and described. 